The engine that lifts the Triple Seven.
A working, to-scale 3D cutaway of the GE90-115B. Spin it up from cold, push the thrust lever to takeoff, and follow a single breath of air through the fan, compressors, fire and turbines.
Nine stations, front to back, in under a tenth of a second.
This half-section is drawn from the same dimensions as the 3D model: 7.28 m long, a 3.25 m fan, a core small enough to hide behind the fan hub. Tap a station to jump straight to it in the explorer.
Two shafts, one inside the other, turning at very different speeds.
They aren't geared together. Each settles at its own speed, which is why a 777 flight deck shows N1 and N2 separately. Turn on Spool colours in the explorer to see which parts belong to which.
Fan + booster ↔ LP turbine
The inner shaft runs the full length of the engine. Six turbine stages at the back turn the giant fan at the front, which makes most of the thrust.
- Stages
- Fan, 4 booster, 6 turbine
- Max speed
- 2,355 rpm
- Fan tip speed
- ≈ 400 m/s, supersonic
HP compressor ↔ HP turbine
A hollow shaft around the LP shaft. Two turbine stages, sitting right behind the flame, drive the nine-stage compressor that squeezes air 42 times over.
- Stages
- 9 compressor, 2 turbine
- Max speed
- 9,332 rpm
- Also drives
- Accessory gearbox
The only engine on three 777 models.
Boeing's long-range 777s were designed around the -115B. Two of them on a wing produce more thrust than all four engines on an early 747.
- 1995
The first GE90s enter service on the original Boeing 777-200.
- 2002
The -115B reaches 127,900 lbf in testing, a world record for jet-engine thrust.
- 2004
Enters service on the 777-300ER, the model that made twin-engine long-haul the norm.
- 2017
Its successor, the GE9X for the 777X, beats the record at 134,300 lbf.
- -300ER777-300ERThe stretched long-haul workhorse, and the -115B's launch aircraft.
- -200LR777-200LR "Worldliner"Built for ultra-long routes of up to about 15,800 km.
- F777 FreighterBased on the -200LR and carries more than 100 tonnes of cargo.
Not a diagram. An engine you can run.
Every blade row is modelled at its real count and position. The gauges come from a simplified model of the engine that responds to the thrust lever.
Orbit, zoom, cut away
Slice the engine open, go X-ray on the cowls, and click any part to fly to it.
Real start sequence
Shut it down, then press Start. The starter spins up N2, fuel lights off, and the engine settles at idle.
Thrust lever to TO/GA
Push from idle to max takeoff and watch the spools lag, EGT climb and fuel flow rise.
777-style EICAS
N1 and EGT dials with redlines, plus N2, fuel flow, thrust and airflow readouts.
Airflow & fire
Bypass and core streams, coloured by temperature, with 24 fuel nozzles feeding the flame.
Engine sound
Synthesised from the real fan blade-passing frequency, so the buzz saw rises with N1.